Substituted morphinans CompoundStructure Desomorphine Dextromethorphan (DXM) Levomethorphan (LVM) Hydromorphone Morphine Codeine Hydrocodone Dihydrocodeine Thebaine Ethylmorphine Oxycodone 6-Monoacetylmorphine (6-MAM) Naloxone Diacetylmorphine (Heroin) Buprenorphine